parker



' (No Mode'L) 2 Sheets-Sheet 1. T. S. PARKER.

1 TRIMMING ATTACHMENT FOR SEWING MACHINES.

Patented Mar. 31,1885.

(N0 ModeL) 2 Sheets-Sheet 2.

T. S. PAR-KER.

TRIMMING ATTAGHMBNT FOR SEWING MACHINES. No. 314,710. Patented Mar. 31,1885.

- invention, such as will enable others skilled UNITED STA'rns PATENT "FFICEO THOMAS S. PARKER, OF SOHENEGTADY, NE\V YORK.

SPECIFICATION forming part of Lett'r s l a tent No. 314,710, dated 'iVIarch 31, 1885.

To all whom it may concern,

Be it known that l, Tnonns S. PARKER, a citizen of the United States, residing at Schcnectady, in the county of Schenectady and State of New York, have invented certain new and useful Improvements in Sewing-Machine Trimmers; and I do declare the following to be a full, clear, and exact description of the in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to that class of sewing and trimming machines that are used for trimming the edges of knit fabrics and similar goods while the same are being sewed.

The drawings show a machine in which a lower stationary knife is arranged in an inclined or nearly vertical position between the upper movable knife and the feed mechanism,

. being adjustably secured to a knitecarrying bar having a longitudinal adjustment within a slot formed in the cloth-plate, said bar supporting a horizontal stationary knife; and the invention consists in the means of securing and adjusting the movable and stationary knives, and in certain novel features in the construction, arrangement, and combination of parts, as hereinafter more fully set forth.

1n the annexed drawings, illustrating the invention, Figure 1 is a rear elevation. Fig. 2 is a plan. Fig. 3 is a perspective detail. Fig. 4 is an end view. Fig. 5 is an side view of the mechanism for supporting and adjusting the lower knives, and shows the relative position of the upper and lower knives. Fig. 6 is a longitudinal section of the bed or cloth plate and lower knife-carrying bars,and shows the relative arrangement of the upper and lower knives and the feed mechanism. Fig. 7

shows detail views illustrating the construction of the lower vertically-inclined knife and the man nor of attaching and adjusting the same. Fig. 8 shows detail views illustrating the manner of attaching the upper knife to its carryingbar. Figs. 9 and 10 are details illustrating modifications in the form of the cutting-edge of the movable knife, and-also showing the movable knife arranged with a stationary knife on each side, as hereinafter described.

Like letters of reference are used to designate the same parts throughout the several views.

The cloth-plate A is recessed'or slotted longitudinally for the reception of the bar B, to which the lower knife, 0, is connected, as

hereinafter described.

As represented in Fig; the bar 15 is supported by a slotted or bifurcated plate, a, that is secured beneath the clothplate. The bar B is provided with aslot, I), through which is passed a shouldered stud, c, that also passes through a slot, (Z, formed in ahorizontal knife, D, that rests upon the knife-carrying bar B.

It will be seen that by turning the stud cafter it has been passed through the slots (Z and =b the shoulders c c at each end of the stud will be made to bear or bind against the upper surface of the knife D and under surface of the plate a, so as to hold a bar, B, and knife D in position.

It will be observed that the lower portion of the bifurcated plate a, as shown in Fig. 6, is provided with a slight swell, against which the lower shoulder, c, of the stud 0 binds when the stud is turned to the position shown in Fig. 6. By turning the stud 0 into the posi- ,tion shown in Fig. 5 it may be withdrawn through the slots 1) and d. The rear end of the knife D is recessed or slotted at cl to fit around the shank of a handle, I), that is attached to the knife-carrying bar B. The forward cndof theknife-carrying bar 13 is curved down, as shown in Figs. 5 and G, to form a bearing for the lower knife, 0, and is so formed that the nearly vertical lower knife, 0, can be arranged or inclined at an angle with the upper knife, E. This curved or in lined portion of the bar B is grooved to receive a tongue or "projection on the rear side of a clamping plate, F, as shown in horizontal section in Fig. '7, said tongue or projecting portion of the plate or clamp F being also caused to pass through the slotted or bifurcated portion of the knife-blade O, a screw,f, being used to connect the parts.

It will. be seen that by simply loosening the screw f, without removing the clamp F, the

knife 0 may be adj ustcd vertically to compen sate for wear.

By referring to Figs. 5 and 6 it will be observed that the cutting-edge of thelower knife, 0, is flush wit-h the cloth-platc,while the knife itself is arranged between the feed mechanism G and the upper knife, E.

Adjoining the feed mechanism,and between it and the lower knife, is a bri lge-pieee, II, that may be integral with the cloth-plate or formed as a portion of a separate plate, II,

that is attached to the cloth-plate, as shown in Figs. 2 and 3. This bridge-piece serves to supwill be done in such a manner as to leave thesewed edges of the goods or fabric perfectly smooth, thus avoiding the rough edges that result when the position oft-he knives is reversed. This manner of arranging the cutting mechanisn'1namcly, with the lower vertical knife 0 between the upper knife and feedalso does away with the usual necessity of providing devices for claniping the goods on the side of the upper k uife farthest from the needle.

Instead of the tendency of the upper or movable knife or cutter to draw the goods down and away from the lower or stationary as in some other machines, it will be seen that the effect produced by the arrangement of devices above described will be directly o p posite, as the upper or movable cutter will draw the goods taut against the lower cutter, thereby producing a smooth-cut edge, and at the same time dispensing with any clamping device. The upper knife, E, and lower knife, 0, are both capable of vertical and endwise adjustment to and from the line of stitch.

It will be seen that the manner of arrang= ing the lower knife, (3, as above described readily admits of this adjustment, and also permits the knife to be entirely removed when required. The lower knife, 0, together with its supporting-bar B, may be readily removed by turning the clamping-stud 0, so as to unlock it from its place under the bed or cloth plate of the machine. The horizontal knife D, that rests 011 the knife-carrying bar B flush 1 with the bed-plate, is also removable, and may be adjusted longitudinally to hold the upper or movable cutter, E, against the edge of the" lower vertical cuttcr, G, at the same time forming with the bridge-piece H a slot or opening, in which the upper knife reciprocates, and aiding in keeping the goods from being drawn down by the action of said knife. This horr zontal knife D, while preferably constructed and arranged as shown, may, if desired, be

knife,

madein one piece with the knife-carrying bar 13, and instead of the stud c a thumb-screw and nut or other similar fastening device may be employed. The upper or movable knife, E, is preferably attached to the lower end of a vertically-reeiprocating bar, I, by means of a clamp, J, and screws g, as shown in Fig. 8. so that it may be readily removed or be adjusted vertically by simply loosening said screws and clamp without entirely removing the same. It will be seen that the clamp J is perforated for the passage of the screws 9 9, while the upper edge of the knife-blade E is notched at c c for asimilar purpose, the notches permitting the knife to be adjusted without removing the clamp or screws. Instead of attaching the knife in this manner, however, it may be connected to the bar I by any ordinary or suitable means. The vertically-reciprocating bar I, that carries the movable knife E, is supported in a box or casing, K, that is slotted on one side, as shown in Fig. 1, to permit the knife'carrying bar to be connected to vibratory lever, L, that is pivoted to an adjustable support, M, which also carries the box or casing K. This construction is similar to that shown in Letters Patent No. 270,467,

, granted to me January 9, 1883, and need not be partlealarly described at this time. The rear end of the lever L is connected at two points to a slotted segment, N, that is also connected to a link, 0, that has a pivoted eonnect-icn with a lever, 1, that is adj ustably connected to a rock-shaft, S, by means of a sleeve and set-screws, as shown. in Figs. 1 and 2. The slotted segment N has a pivoted connection with the lever L and link 0, and is provided with a thumbscrew and nut, Q, by which the lever L may be adjusted and secured to vary the throw of the movable knife By means of the adjustable support M, which is capable of an endwise adjustment in a bracket attached to the clotlrplate, the movable knife I may also be adjusted laterally to or from the edge of the stationary knife 0. The horizontal knife D may be used as a lower knife either with or without the lower inclined knife, 0.

\Vhen the knife D is used in connection with the knives C and E, the several knives will be arranged as shown in Figs. 5, 6, 9, and 10. There will thus be one upper knife and two lower knives, one horizontal and the other vertical, or nearly so, and the cutting-edges of the lower knives will form a slot with cuttingedgcs for the reception of the cutting-edge of the upper knife. in this case the upper knife will be preferably made in the form of a punch, as shown in Fig. 9, so as to presentto the fabrie a square or rectangular surface, or it may he grooved longitudinally on its lower end to form a cutting-edge on each side, as shown in Fig. 1d.

it will be seen that whenever it is desired to change the distance between the line of cut and the line of stitch, which is done by adjusting the upper knife, E, laterally, thclowel' knives, C and D, can then be readily adjust i to bear on both sides of the upper knife, thus forming a perfect-fitting slot, within which the upper knife may be operated.

It is obvious that if the upper knife or cutter, E,is made with rectangular edges, as shown in Fig. 9, and is arranged in the slot formed by the cutting'edges of the lower knives, C and D, it will act as a punch against the cutting-edges of said lower knives, so as to sever the fabric with a clean cut and leave it with a smooth edge. v

The rock-shaft S is actuated by a lever, ii, and connected mechanism in the ordinary manner, as represented in Fig. 1,the feed mechanism, needlearm T, and upper knife, in, being thus simultaneously operated. The p reeser-foot U is connected with the head Y in the ordinary manner.

From the foregoing description the operation of the machine will be readily understood, and need not be further explained.

\Vhat I claim as my invention is 1. In a sewing-machine trimmer, the com biuation of an upper movable knife, a lower stationary knife arranged horizontally on one side of said upper knife, and a lowerstatiouary knife arranged in a verticallyinclined po sition on the opposite side of the upper knife, substantially as described.

bination of an upper knife, a slotted elothplate, a nearly vertical lower knife adjustably secured to a knifecarrying bar having a longitudinal adjustment within a slot formed in. 1

the cloth-plate, and means for securing said bar in position, substantially as described.

3. In a sewingmachine trimmer, the com-' bination of an upper knife, a slotted clothplate, a nearly vertical lower knife, a knifeearrying bar curved at one end and provided with an inclined bearing for said lower knife, means for adjust-ably securing said knife, a horizontal knife resting on the knife-carrying bar, and forming one side of a slotthat receives the cutting-edge of the upper k nife,and means for securing and imparting a longitudinal adjustment to the k nife-carrying bar and horizontal knife, substantially as described.

it. In a sewing-machine trimmer, the combination of the slotted cloth-plate A, feed mechanism G, bridge-piece H, movable knife E, slotted knife-carrying bar B, the lower stationary knife, G, adjustably secured to said bar by means of a clamp, F, and screwsf, and arranged in a vertically-inclined position with its cutting-edge between the upper knife and the feed, the horizontal slotted knife D, resting on the knife-carrying bar B, and the shouldered stud 0, adapted to clamp said parts in position, substantially as described.

5. in a sewing-machine trimmer, the combination of the movable knife E, the slotted cloth-plate A, the knife-carrying bar B. the lower stationary knife, G, having clamp F and serewf, and means for imparting longitudinal adjustment to the lower knife-carrying 2. In a sewing-machine trimmer, the comi bar, substantially as described.

In testimony whereof I affix my signature in p reseneeof two witnesses.

THOMAS S. PARKER. \Vi tuesses:

BEN-TAMI)? PARKER, J oar F. CLUTE. 

